In this study, amine-modified MCM-41/poly(methyl methacrylate) nanocomposites (m-MCM-41/PMMA NCs) were fabricated through in situ polymerization method and ultrasonic irradiation technique. The as-prepared nanocomposites were utilized for adsorption of Cu²⁺ ions from aqueous media. Physico-chemical properties of m-MCM-41/PMMA NCs were studied by thermogravimetric analysis (TGA), transmission and scanning electron microscopes (TEM and SEM), small angle X-ray scattering (SAXS), and Fourier transform infrared (FT-IR) spectroscopy. Based on analysis data, 2 wt% NC was selected for adsorption studies and the pH effect, contact time, and initial concentration of metal ions was investigated. The adsorption mechanism and kinetics were evaluated using three kinetic models namely pseudo-second-order, Elovich, and intraparticle diffusion. In addition, the adsorptive performance of the …